Connecting device



Nov. 1, 1927.

I w. F. HENDRY CONNECTING DEVICE Filed Jan. 7, 1924 Wyygfmon BY L I W AATToRNEy w nnmiurfnnnnnr, or ossrnrnegnnw YonK, ssmaoaaofmma miaamount-'3 I :CAL SUPPLY COMPANY, rnoonroan rnn, .orfnnw YOBK,- N.'ooaronnmon or MASSACHUSETTS.

Application filed January '7, 1 92 1. Serial No. G84;7 56.--

.This invention. relates .to connecting devices for electricalconductors, andmore particularly to improvements in a base. for

' electrical attachment.plugs.-,,.

' few parts} in which the. use of screws, rivets The object of'theinventionisto provide.

a connecting device which is composed ofa I and the like is obviated anda good and preferably, continuous connection is bad between pairs 'ofcontacts of the connecting device. 7

With thisobject in view I provide a base for an electrical attachmentplug in which of a single piece of wire, the two wires which a contactspring and the corresponding contact-making element of the base areformed are used to be formed into the two contacts and correspondingcontact-making surfaces being 'separated'from each other by means of aninsulating body. In this mannera base is produced which is composed ofonly three elements; ftwo springs suitablyshaped ing plug cap and aninsulating body within and around which theyv -may be attached. Thevresulting structure will be not onlyinexpensive of manufacture andsturdy of construction, but will have the highly desirable quality ofthe presence of a continuous conductor between -the spring andcontact-making surface,

avoiding'therefore the necessity of depending on screwed, riveted orsoldered joints between these two elements. The proper resiliency of thecontact spring forming parts of the wires is insured by'the resiliencyof the wire itself. I

Obviously, the invention may be subject to variations without departingfrom the spirit thereof. The shaping of the wires and their Fig. 3 1s atop end view of the base; .Fig. 4 is a bottom end view;

Figs. 5 and 7 are perspective views of the two continuous wires used inthe assembly of the'plug; and y CONNECTING nnvronf Fig. 6 y is.avertical. cross section along lines 6-6 of Fig. 3.- The base iscomposed tin'uous' pieces of wire-2fand 3. The bodyl ofl-lthree parts,j; body of. insulatlng material .'1- and two: con-' isprovided withaknurled crown 4 bymeans of which. itmaybe grasped, and with'threevertical passages 5, 6 and 7 of which the central passage 6 isprovided with a recessed portion 8. .The passages 6 and 7 traverse thebody 1 throughout its length, but "the passage 5 terminates slightlybelow the top of the-body in a lateral outlet'9. The upper] part of thebody 1 is provided with aspiralledgroove 10. A central projection 11,

provided on top of the body 1, maybe either molded of one piece withthebody, or provided in the form ofaseparate disc.

The. continuous piece of wire 2 is sub-Stan tially; U'shaped with oneofthe legs slightly longer and terminating in a corrugated contact-makingspring 12., The wire is spi ralled around itself at the connecting pointQ of the U, as shown at 13, the fulllines indicating the normal positionof the wire before assembly. ends 14 formed into a cont-act-makingspringcorresponding to 12, then the wire is bent at The wire 3 has one of'itsv substantially right angles at 15 and spiralled around the leg 14, asshown at'16, terminat ing in an end 17, which is bent substantially"radially with respect to the spiral'co nvolutions. V

. In assembling the base the wi 3 v I snapped'into place with the end 17driven into an aperture in the body, the spiral con .volutions 16 lyingin the: spiralled grooves 10, the straight portion 1 5 projectingthroughthe outlet 9 and the contact spring portion14 projecting Within thepassage 5. The wire 2 is then shoved in-place with the contact springpassage 7 and t piece :12 projecting .within e straight portionproject-g ingwithin 'passagefi. The-spiralled end 13 1 of the wire 2isnow hammered down into a cooperate with the contact springs let and 12Y 2 which are constituted by the free and resilient legs of the wires 2and WVhat I claim is:

1. In an electrical attachment plug, an insulating body, a verticalpassage said body having ,a lateral outlet, a spiral groove around saidbody, a continuous piece of resilient Wire one end of Which is bent tobe driven into said body, the other end formed to be introduced throughsaid outlet in said passa 'e to serve thereinas a contact spring,and'tIie intervening portion is spiralled to lie in said groove andserve as a screwthreaded contact-making surface.

.2. In electrical attachment plug, an insulating body, two passagesthrough said body, one of said passages having a recessed portionresilient Wire bent into U-shape Wit-11' spiral c'onvolutions near themiddle portion, one vleg of said U being inserted insaidone of saidpassages and curled against the recessed portion, the other leg beinginserted in another passage to serve therein as a contact spring, andthe convolutions being flattened against the top of the body to serve asa contact-making surface. 7

3. In an electrical attachment plug, an insulating body having aplurality of passages, a continuous piece of Wire constituting onecontact spring Within a passage, and a screw-threaded contact-makingsurface around a portion of said body, and a second continuous piece ofWire constituting another contact spring Within another passage, and acontact-making surface at the end of said body. 7

In Witness whereof, I hereunto subscribe,

my name this 4th dayof January, 192

\VILLIAM F. HEND-RY.

